Evaluation of bovine leukosis prevalence in bovine slaughtering in one of industrial slaughterhouses of Tehran province during (2003-2011)

Bovine leukosis is a viral zoonotic disease that can infect cattle. Blood, secretions, meat, dairy products and biological products may be contaminated with this virus. For this purpose bovine leukosis cases were studied during this 10-years in one of industrial slaughterhouses of Tehran province to thereby identify the factors of increasing incidence of this disease and to present effective ways to reduce it. This study carried out in one of slaughterhouses of Tehran province. Inspections for about 132 leukosis bovine meats in the carcass of slaughtered cows with histopathological examination were conducted. The results were shows that among 132 leukosis cows, all of cases were maternal, over2 years old and mean weight of them were 180 kg. Most of them were in the summer. Most cases were seen in the carcass of the industrial farms (79.5%) and then the traditional farms (20.5%), respectively.In this study was diagnosed some symptoms in carcass of slaughtered cattle such as enlarged lymph nodes (external and internal iliac, deep inguinal and plstronis), heart and other organs with edema. For diagnosis improving and right slaughterhouse assessment and its role in human health, must be trained inspectors in the diagnosis of bovine leukosis properly. In addition histopathological studies are required in the slaughterhouse laboratory. Also control and eradication of diseases in farm seems to be effective in reducing disease